Sandstone
Arenite (specifically sublithic or quartz arenite)
sedimentary
Category
Mineral, Specifically A Detrital Grain
Browse mineral, specifically a detrital grain specimens identified by the Rock Identifier community.
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Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
metamorphic
Pink Granite
Granite (Phaneritic Acidic Igneous Rock)
igneous
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with iron oxide Fe2O3 cement)
sedimentary
Sandstone (specifically an Iron-Concretion)
Arenite with Iron Oxide (Limonite/Goethite) cementation
sedimentary
Agate (specifically Chalcedony/Banded Agate)
Silicon Dioxide (SiO2)
sedimentary
Conglomerate
Conglomerate (Detrital Sedimentary Rock)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
metamorphic
River Pebbles (Quartzite / Granite Pebbles)
SiO2 (Quartz-rich detrital gravel)
sedimentary
Ferruginous Sandstone
Sandstone with iron oxide (Hematite/Limonite) cement
sedimentary
Sandstone
Arenite (specifically Quartz Arenite)
sedimentary
Pink Feldspar with Quartz
Potassium Feldspar (Orthoclase) with SiO2
igneous
Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
Pink Granite
Felsic Plutonic Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)
Igneous
Sandstone
Arenite (specifically Quartz Arenite)
sedimentary
Granitoid (with Epidote and Orthoclase)
Crystalline Felsic Intrusive Rock (containing SiO2, KAlSi3O8, and Ca2(Al2,Fe)(Si2O7)(SiO4)O(OH))
igneous
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-feldspar, Quartz, and Biotite)
igneous
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Sandstone (Ferruginous)
Arenite with Iron Oxide staining (Fe2O3)
sedimentary
Greenstone
Greenschist (composed of chlorite, actinolite, and epidote)
metamorphic
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
Sandstone (Micaceous/Feldspathic variant)
Arenite (specifically subarkose or lithic arenite)
sedimentary
Greenschist
Greenschist (Chlorite-actinolite schist)
metamorphic
Quartz (Milky Quartz)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Moonstone (Green Moonstone / Garnierite)
Potassium Aluminum Silicate (KAlSi3O8) with inclusions of Garnierite
mineral
Pink Granite
Phaneritic Intrusive Igneous Rock (Granite)
igneous
Sandstone Concretion (Omar or Nut Rock)
Sedimentary Concretion (specifically an 'Omarolluk' or Omar)
sedimentary
Foliated Metamorphic Rock (likely Gneiss or Schist)
Gneissic Metamorphic Rock
metamorphic
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2
mineral
Carnelian
Carnelian (SiO2)
mineral
Green Sandstone
Glauconitic Sandstone
sedimentary
Greenstone / Epidosite
Metamorphosed Mafic Igneous Rock (Epidote-Chlorite group)
metamorphic
Pink Granite
Granite (Phaneritic igneous rock rich in Alkali Feldspar and Quartz)
igneous
Pink Granite
Granite (Phaneritic Igneous Rock)
igneous
Pink Granite
Phaneritic intrusive igneous rock (Felsic)
igneous
Brecciated Jasper
Silicon dioxide (SiO2) microcrystalline quartz breccia
sedimentary
Granite / Gneiss Ballast Rock
Granite (Quartzo-feldspathic rock)
igneous
Quartz
Silicon Dioxide (SiO₂)
Mineral
Sandstone
Sandstone (Quartzose/Feldspathic Sandstone)
sedimentary
Labradorite (tumbled)
Labradorite (a plagioclase feldspar mineral between anorthite and albite; chemical formula: (Ca,Na)(Si,Al)4O8)
Mineral
Sandstone (Graywacke)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary